M&MA

Mobile Terminated Call         • The calling party dials the MSISDN for the mobile subscriber. • The PSTN identifies the network (PLMN) that the dialed MSISDN belongs to and will locate a GMSC for that network.         • The PSTN sends an Initial Address message to the GMSC. •T he GMSC forwards the MSISDN to the HLR and requests routing information for it. • The HLR looks up the MSISDN and determines the IMSI and the SS7 address for the MSC/VLR that is servicing the MS. •T he HLR then contacts the servicing MSC/VLR and asks it to assign a Mobile Station Routing Number (MSRN) to the call. (a MSRN is assigned to the call not to the MS itself. ) • The MSC/VLR allocates the MSRN and forwards it to the HLR.

GSM Call Flow (GSM Originating Call) Call Setup GSM Flow Call Setup GSM Flow: •              The MSC sends an Initial Address Message (IAM) to the GMSC. The IAM contains the MSISDN of the called party as the MS dialed it. •              The MSC will also send a Call Proceeding (CALL_PROC) message down to the BSS and this is when the BSS would assign a TCH to the MS, as described earlier •              Based on the dialed number, the GMSC decides where to route the IAM within the PSTN. •              The PSTN will continue to route the IAM until it reaches the correct Switching Center and the call routing is complete. The PSTN will then establish the call circuit and send an Address Complete Message (ACM) back to the GMSC. •              The GMSC then forwards the ACM back to the responsible MSC indicating that the call circuit has been established. Call Establishment •              Once the MSC receives the ACM, it sends an ALERT message

Introduction Ray Model 1. Optical fiber is basically a solid glass rod. The diameter of rod is so small that it looks like a fiber. 2. Optical fiber is a dielectric waveguide. The light travels like an electromagnetic wave inside the waveguide. The dielectric waveguide is different from a metallic waveguide which is used at microwave and millimeter wave frequencies. 3. In a metallic waveguide, there is a complete shielding of electromagnetic radiation but in an optical fiber the electromagnetic radiation is not just confined inside the fiber but also extends outside the fiber. 4. The light gets guided inside the structure, through the basic phenomenon of total internal reflection . 5. The optical fiber consists of two concentric cylinders; the inside solid cylinder is called the core and the surrounding 6. For the light to propagate inside the fiber through total internal reflections at core-cladding interface, the refractive index of the core must be greater tha

BROADBAND COMMUNICATION QUESTION BANK 1.  (a)           What are the advantages of optical fiber cables over the co-axial cables?     (06) (b) Calculate NA, Acceptance angle and Angle of fiber with core and cladding refractive index values as n 1 =1.5 and n 2 =1.45 respectively.                                                                    (06) (c) Explain the “mode theory” of optical fiber.     (06) 2.  (a)           What is meant by acceptance angle and acceptance cone for optical fiber? Show and explain it’s relationship to numerical aperture and refractive indices of core & cladding. (06) (b) If a MMSI fiber of core radius 25 micrometer operating at 1300nm, has  core and cladding refractive index as 1.5 & 1.38 respectively; Calculate Numerical aperture, Normalized frequency, Solid acceptance angle and number of modes ent

WIRELESS NETWORKS QUESTION BANK QUESTION BANK FOR WIRELESS NETWORKS : Q.1.What are draw back of  2G  Services ? What are its silent features of 3G services that overcome the drawbacks of 2G services? Q.2.Discuss the features of IMT2000 that have been adopted in UMTS/3G services. Q.3.Explain the basic concept of WCDMA ?Which is a air interface of UMTS. Q.4.Give the specification of WCDMA air interface .Also  explain how the information /message  is coded and scrambled in WCDMA Q.5.Explain in brief the physical channels in WCDMA and the function performed by them Q.6.Explain the transport channel in CDMA that are mapped on the physical channel. Q.7.Draw the architecture of 3GPP RELEASE  4 distributed network architecture. Q.8. .Draw the architecture of 3GPP RELEASE  5 All IP multimedia  network architecture. Q.9.What is ALL IP network ? Explain its architecture  ? Explain its Advantages? Q.10.What  is core network ?Explain its architecture ? Q.13.Write a s

Meaning of Satellite & Basic concepts: Satellite: "satellite is object which rotates around some body due to the effect of gravitational forces" . OR "A  satellite is an object  which has been  placed  into orbit by human endeavor" .

Multiplexing Definition and types: Definition: Multi means 'Many', Plexing means ' having parts or units ' combinely latin meaning suggest this but in reality this term is used for multiplexing of signals in telecommunications   " Multiplexing is the procedure in which numerous Data Streams, originating from diverse Sources, are joined and Transmitted over a Single Data Channel or Data Stream."